makeForm {mvpart} | R Documentation |
This function constructs a formula from a data frame given the locations of the response and other variables. It is useful for long or repetitive formulas.
makeForm(data, ycol, xcol, zcol, FUN, maxy = 20, extra)
data |
The data frame or matrix for which the formula is to be contructed, |
ycol |
The locations (or names) of the response variables in data . |
xcol |
The locations (or names) of the explanatory variables in data . |
zcol |
The locations (or names) of the conditioning variables in data ;
for use in the vegan package. |
FUN |
A function to apply to the response. |
maxy |
The number of multivariate responses before abbreviated notation is used. see examples below. |
extra |
Extra term(s) for the RHS of the formula. |
makeForm constructs a formula and is useful for long and/or repetitive formulae. See examples below.
Returns a formula.
data(spider) makeForm(spider,1,13:18) # arct.lute ~ water + sand + moss + reft + twigs + herbs makeForm(spider,1:12,13:18) # cbind(arct.lute, pard.lugu, zora.spin, pard.nigr, pard.pull, # aulo.albi, troc.terr, alop.cune, pard.mont, alop.acce, alop.fabr, # arct.peri) ~ water + sand + moss + reft + twigs + herbs makeForm(spider,1:12,13:15,16:18) # cbind(arct.lute, pard.lugu, zora.spin, pard.nigr, pard.pull, # aulo.albi, troc.terr, alop.cune, pard.mont, alop.acce, alop.fabr, # arct.peri) ~ water + sand + moss + Condition(reft + twigs + herbs) makeForm(spider,1:12,13:15,maxy=6) # as.matrix(spider[, 1:12]) ~ water + sand + moss makeForm(spider,1:3,13:15,FUN=sqrt) # sqrt(cbind(arct.lute, pard.lugu, zora.spin)) ~ water + sand + moss makeForm(spider,1:3,13:15,FUN=sqrt,extra="I(water^2)+") # sqrt(cbind(arct.lute, pard.lugu, zora.spin)) ~ I(water^2) + water + # sand + moss